Cafeteria roenbergensis, Fenchel & D.J.Patt.

Aydin, Esra Elif & Lee, Won Je, 2022, Free-living Heterotrophic Flagellates Lakes in Turkey (Protista) from Two Hypersaline, Acta Protozoologica 61, pp. 85-98 : 92-93

Cafeteria roenbergensis ( Figs 2g , 3c )

Cells are 7–8 μm long, D-shaped, laterally compressed and with a shallow groove on the left side. Two flagella of similar length emerging subapically and are slightly longer than the cell. In the attached cells the anterior flagellum is directed perpendicular to the ventral face of the cell and the posterior flagellum is reflexed, passing over one face of the cell and then attaching to the substrate by the tip. In the swimming cells the anterior flagellum is directed forwards and is beating with a sine wave. The posterior flagellum is directed backwards. And moves fast following a spiral path. Description is based on the observations of 23 cells. Occurance: every month at Acı Lake, temperature 1–23.5 °C, salinity 24–67.5 psu, dissolved oxygen 3.75–13.2 mg /L.

Remarks: Generally, the observations are consistent with the descriptions of Fenchel and Patterson (1988) and Larsen and Patterson (1990) ’s Cafeteria roenbergensis . Cavalier-Smith and Chao (2006) and Schoenle et al. (2020) carried out molecular studies and separated the Cafeteria into two known species – C. roenbergensis and C. mylnikovii – and with the same study six new species ( C. maldiviensis , C. biegae , C. loberiensis , C. chilensis , C. graefeae , C. burkhardae ) established respectively. These Cafeteria species closely resemble to Cafeteria roenbergensis and cannot be easily distinguished each other without molecular studies. Thus, in this study, we prefer to follow the criteria described by previous works ( Larsen and Patterson 1990, Lee and Patterson 2000, Al-Qassab et al. 2002, Lee 2015) for these morphospecies. This species resembles to Cafeteria minuta (Ruinen 1938) Lee and Patterson 1990 in general appearance, but is distinguishable by the longer anterior flagellum of C. minuta . Cafeteria roenbergensis resembles Cantina marsupialis ( Larsen and Patterson 1990) ( Yubuki et al. 2015) in general appearance and in having a short anterior flagellum, but C. marsupialis is slightly larger and has a more strongly developed ventral groove with a posterior channel leading into the cell. Previously reported studies for Cafeteria roenbergensis gave the size range to be 1.5 to 10 μm (Fenchel and Patterson 1988, Larsen and Patterson 1990; Vørs 1992a, b; Patterson et al. 1993, Vørs et al. 1995, Ekebom et al. 1996, Patterson and Simpson 1996; Tong 1997b, c; Tong et al. 1997, 1998; Bernard et al. 2000, Lee 2015). Cafeteria roenbergensis has a worldwide distribution ( Lee and Patterson 1998, Lee 2002, Al-Qassab et al. 2002, Lee et al. 2003, Aydın and Lee 2012).

Figures

Fig. 2. (a) Ancyromonas sigmoides, (b) Neobodo curvifilus, (c) Chelonemonas sp., (d) Carpediemonas membranifera, (e) Caecitellus parvulus, (f) Codosiga botrytis, (g) Cafeteria roenbergensis, (h) Pleurostomum flabellatum, (i) Rhynchomonas nasuta, (j) Salpingoeca marina, (k) Pendulomonas adriperis, (l) Neobodo saliens, (m) unidentified protist, (n) Neobodo designis, (o) Monosiga brevicollis, (p) Halocafeteria seosinensis, (q) Cantina marsupialis.

Fig. 3. (a) Ancyromonas sigmoides, (b) Caecitellus parvulus, (c) Cafeteria roenbergensis, (d) Cantina marsupialis, (e) Chelonemonas sp., (f) Codosiga botrytis, (g) Carpediemonas membranifera, (h) Neobodo curvifilus, (i) Neobodo designis, (j) Neobodo saliens, (k) unidentified protist, (l)-(m) Pleurostomum flabellatum, (n) Rhyncomonas nasuta, (o) Monosiga brevicollis, (p) Salpingoeca marina, (q) Pendulomonas adriperis, (r) Halocafeteria seosinensis. All micrographs are DIC images. Scale bar in (k) represents for all figures.